Empirical and Molecular Formulas

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄ 
• K₈SO₁₆
• K₈S₄O₈ 
• K₈S₄O₁₆ 

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

• C₂H₃O₂
• CH₂O
• C₂H₄O₂
• C₃H₈O₃

Tags

NGSS.HS-PS1-1

Empirical Formula = CF₂

Molecular formula mass = 192

Molecular Formula = ?

• C₄F₈

• C₄F

• CF₈

• C₂F₄

Phenyl magnesium bromide is used as a reagent in organic synthesis. Determine its molecular formula if its molar mass is 181.31 g/mol and it contains 39.75% C, 2.78% H, 13.41% Mg, and 44.07% Br (these are in the correct order).

• C₁₂H₁₀Mg₂Br₂

• CHMgBr

• C₆H₅MgBr

• C₃H_2.5MgBr

Tags

NGSS.HS-PS1-7

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

What is the molecular formula of a compound with an empirical formula of C₂OH₄ and a molar mass of 88 grams per mole?

• C₂O₄H₈
• C₈O₂H₄
• C₄O₂H₈
• C₄O₈H₂

What is the molecular formula for a compound with the empirical formula: CaCl₂  and a molecular mass of 330g.

• Ca₂Cl₄
• Ca₃Cl₆
• Ca₃Cl₉
• Ca₃Cl₅

What is the molecular formula for a compound with the empirical formula: CaCl₂ and a molecular mass of 220g.

• Ca₂Cl₄

• Ca₃Cl₆

• Ca₃Cl₉

• Ca₃Cl₅

The empirical formula of a substance is CH₂O. The molar mass is 180g/mol. What is the molecular formula?

• CH₂O

• C₃H₆O₃

• C₆H₁₂O₆

• C₁₂H₆O₁₂

Tags

NGSS.HS-PS1-7